*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #F7F7F8;
  --surface:   #FFFFFF;
  --surface-2: #FBFBFC;
  --raise:     #F1F1F3;
  --text:      #1B1B1F;
  --text-2:    #65656F;
  --text-3:    #9A9AA4;
  --border:    #E8E8EC;
  --border-2:  #DEDEE3;
  --accent:    #3355E8;
  --accent-h:  #2444C7;
  --accent-bg: rgba(51,85,232,.07);
  --ok:        #12855A;
  --ok-bg:     rgba(18,133,90,.08);
  --bad:       #C13B31;
  --bad-bg:    rgba(193,59,49,.07);
  --shadow:    0 24px 60px -12px rgba(15,15,20,.22);

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #111114;
    --surface:   #18181C;
    --surface-2: #1C1C21;
    --raise:     #22222A;
    --text:      #ECECF0;
    --text-2:    #95959F;
    --text-3:    #5E5E69;
    --border:    #26262E;
    --border-2:  #31313A;
    --accent:    #6C86FF;
    --accent-h:  #8AA0FF;
    --accent-bg: rgba(108,134,255,.1);
    --ok:        #35BC85;
    --ok-bg:     rgba(53,188,133,.11);
    --bad:       #E8695E;
    --bad-bg:    rgba(232,105,94,.1);
    --shadow:    0 24px 60px -12px rgba(0,0,0,.55);
  }
}

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* ── Page Layout ────────────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-bg) 0%, transparent 60%),
    var(--bg);
}

/* ── Brand ──────────────────────────────────────────────────────────── */
.auth-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 26px;
  color: var(--text);
}
.brand-icon {
  width: 26px; height: 26px;
  border-radius: 6px;
  background: #FFFFFF;
  border: 1px solid #DEDEE3;
  color: #1B1B1F;
  font-size: 14px;
  display: inline-flex; align-items: center; justify-content: center;
}
.brand-name { color: var(--text); }

/* ── Card ───────────────────────────────────────────────────────────── */
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* ── Tabs ───────────────────────────────────────────────────────────── */
.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.auth-tab {
  flex: 1;
  background: none;
  border: none;
  padding: 13px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-3);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  font-family: inherit;
}
.auth-tab:hover { color: var(--text-2); background: var(--raise); }
.auth-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Form ───────────────────────────────────────────────────────────── */
.auth-form { padding: 26px 26px 22px; }

.auth-title    { font-size: 18px; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 6px; }
.auth-subtitle { font-size: 13px; color: var(--text-3); margin-bottom: 20px; }

.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 15px; }
.form-group label { font-size: 11px; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; }
.hint { font-size: 11px; font-weight: 400; color: var(--text-3); text-transform: none; letter-spacing: 0; }

.form-group-header { display: flex; justify-content: space-between; align-items: baseline; }
.link-sm { font-size: 12.5px; font-weight: 500; color: var(--accent); text-decoration: none; }
.link-sm:hover { text-decoration: underline; }

.input-wrap { position: relative; display: flex; align-items: center; }
.input-wrap input { padding-right: 42px !important; width: 100%; }

.form-group input {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  padding: 10px 14px;
  outline: none;
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: inherit;
}
.form-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
.form-group input::placeholder { color: var(--text-3); }

.toggle-pw {
  position: absolute;
  right: 10px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  opacity: 0.5;
  padding: 4px;
  line-height: 1;
}
.toggle-pw:hover { opacity: 1; }

/* ── Messages ───────────────────────────────────────────────────────── */
.auth-error {
  background: var(--bad-bg);
  border: 1px solid color-mix(in srgb, var(--bad) 35%, transparent);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--bad);
  margin-bottom: 14px;
}
.auth-success {
  background: var(--ok-bg);
  border: 1px solid color-mix(in srgb, var(--ok) 35%, transparent);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--ok);
  margin-bottom: 14px;
}

/* ── Button ─────────────────────────────────────────────────────────── */
.btn-auth {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
  margin-bottom: 16px;
  font-family: inherit;
}
.btn-auth:hover   { filter: brightness(1.08); }
.btn-auth:active  { transform: scale(0.98); }
.btn-auth:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── OAuth Button ────────────────────────────────────────────────────── */
.btn-oauth {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--surface-2);
  color: var(--text-2);
  border: 1px solid var(--border-2);
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  margin-bottom: 16px;
  font-family: inherit;
}
.btn-oauth:hover {
  background: var(--raise);
  border-color: var(--accent);
  color: var(--text);
}
.btn-oauth:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── Divider ─────────────────────────────────────────────────────────── */
.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  color: var(--text-3);
  font-size: 12px;
}
.auth-divider::before,
.auth-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* ── Links ───────────────────────────────────────────────────────────── */
.auth-switch { font-size: 13px; color: var(--text-3); text-align: center; }
.auth-switch a { color: var(--accent); text-decoration: none; font-weight: 500; }
.auth-switch a:hover { text-decoration: underline; }

/* ── Footer ──────────────────────────────────────────────────────────── */
.auth-footer {
  margin-top: 22px;
  font-size: 12px;
  color: var(--text-3);
  text-align: center;
}
.auth-footer a { color: var(--text-3); text-decoration: none; }
.auth-footer a:hover { color: var(--text-2); text-decoration: underline; }